runtime: remove unused xchgp/xchgp1
I noticed that they were unimplemented on arm64 but then that they were
in fact not used at all.
Change-Id: Iee579feda2a5e374fa571bcc8c89e4ef607d50f6
Reviewed-on: https://go-review.googlesource.com/13951
Run-TryBot: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/src/runtime/atomic_pointer.go b/src/runtime/atomic_pointer.go
index f84afe0..ec2ea8a 100644
--- a/src/runtime/atomic_pointer.go
+++ b/src/runtime/atomic_pointer.go
@@ -10,7 +10,7 @@
// because while ptr does not escape, new does.
// If new is marked as not escaping, the compiler will make incorrect
// escape analysis decisions about the pointer value being stored.
-// Instead, these are wrappers around the actual atomics (xchgp1 and so on)
+// Instead, these are wrappers around the actual atomics (casp1 and so on)
// that use noescape to convey which arguments do not escape.
//
// Additionally, these functions must update the shadow heap for
@@ -23,13 +23,6 @@
}
//go:nosplit
-func xchgp(ptr unsafe.Pointer, new unsafe.Pointer) unsafe.Pointer {
- old := xchgp1(noescape(ptr), new)
- writebarrierptr_nostore((*uintptr)(ptr), uintptr(new))
- return old
-}
-
-//go:nosplit
func casp(ptr *unsafe.Pointer, old, new unsafe.Pointer) bool {
if !casp1((*unsafe.Pointer)(noescape(unsafe.Pointer(ptr))), noescape(old), new) {
return false
